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haven't tried it, but maybe it helps finding a way: To match a form, you should use

formParameters

:

"formParameters": {
      "tool": {
        "equalTo": "WireMock"
      }
    }

I don't know whether there is a matcher for `exists`/`doesNotExist` but you may be able mimic this with `doesNotMatch`:

"formParameters": {
      "code": {
        "doesNotMatch": ".+"
      }
    }

I tested using this way:

"form parameters": {
        "code": {
          "doesNotMatch": ".+"
        }
      }

I don't know if I did something wrong: but I'm getting the following error:

Unrecognized field "formParameters" (class com.github.tomakehurst.wiremock.matching.RequestPattern), not marked as ignorable

"formParameters": {
      "grant_type": {
        "equalTo": "authorization_code"
      },
      "code": {
        "absent": true
      }
    }

Should work

I got it this way:

"formParameters": {
      "grant_type": {
        "equalTo": "authorization_code"
      },
      "code": {
        "absent": true
      }
    }

But I needed to update the version of the wiremock I was using to the latest version available. Thank you very much.